Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method comprising: transmitting, from an access point, a trigger frame to stations of a target wake time (TWT) session during a TWT service period of the TWT session; receiving, at the access point, respective uplink frames from the stations in response to transmission of the trigger frame; and transmitting, from the access point, a multi-block acknowledgment (M-BA) frame with a per association identifier traffic identifier (per AID TID) field configured to indicate whether one or more of the stations are permitted to enter a low-power state before an end of the TWT service period, the M-BA frame effective to cause at least one of the stations to enter the low-power state before the end of the TWT service period, the per AID TID field of the M-BA frame being configured to provide an indication as to whether the one or more stations are to use a more data field of the media access control (MAC) layer header of the M-BA frame to determine if the low-power state is permitted.
This invention relates to wireless communication systems, specifically methods for managing power efficiency in Wi-Fi networks using Target Wake Time (TWT) sessions. The problem addressed is the inefficiency in power consumption during TWT service periods, where stations (devices) remain active longer than necessary, wasting energy. The method involves an access point (AP) transmitting a trigger frame to stations participating in a TWT session during a TWT service period. The stations respond with uplink frames. The AP then sends a multi-block acknowledgment (M-BA) frame containing a per association identifier traffic identifier (per AID TID) field. This field indicates whether certain stations are permitted to enter a low-power state before the end of the TWT service period. The M-BA frame signals at least one station to transition to a low-power state early, conserving energy. The per AID TID field also directs stations to check the "more data" field in the MAC layer header of the M-BA frame to determine if entering the low-power state is allowed. This approach optimizes power usage by allowing stations to sleep earlier when no further data is expected, improving battery life in wireless devices.
2. The method as recited in claim 1 , further comprising performing, after transmission of the M-BA frame, a frame exchange during the service period with at least another of the stations that was not permitted to enter the low-power state before the end of the service period.
This invention relates to wireless communication systems, specifically methods for managing power states in a network where multiple stations communicate with an access point. The problem addressed is inefficient power management during service periods, where some stations may enter a low-power state prematurely, disrupting communication with other stations that still require active transmission. The method involves transmitting a multi-station block acknowledgment (M-BA) frame to acknowledge data received from multiple stations during a service period. After sending the M-BA frame, the system performs a frame exchange with at least one additional station that was not permitted to enter a low-power state before the service period ends. This ensures that all stations complete their necessary transmissions without prematurely entering low-power mode, improving energy efficiency and communication reliability. The method may also include scheduling transmissions, managing acknowledgment frames, and coordinating power states to optimize network performance. By dynamically adjusting power states based on ongoing communication needs, the system avoids disruptions and ensures all stations remain active until their transmissions are complete.
3. The method as recited in claim 1 , wherein a reserved bit in the per AID TID field of the M-BA frame provides the indication that the one or more stations are to use the more data field of the MAC layer header of the M-BA frame to determine if the low-power state is permitted.
This invention relates to wireless communication systems, specifically methods for managing power states in stations (devices) within a network. The problem addressed is the need for efficient signaling to allow stations to enter a low-power state while minimizing unnecessary wake-ups and maintaining synchronization with the access point (AP). The method involves using a reserved bit in the per-AID (Association Identifier) TID (Traffic Identifier) field of a Multi-Station Block Acknowledgment (M-BA) frame to indicate whether stations are permitted to enter a low-power state. When this bit is set, stations must check the "more data" field in the MAC (Medium Access Control) layer header of the M-BA frame to determine if the low-power state is allowed. If the "more data" field indicates no additional data is pending, the station can enter the low-power state. This approach reduces power consumption by avoiding unnecessary wake-ups while ensuring stations remain synchronized with the AP. The method ensures that stations only enter a low-power state when it is safe to do so, based on the AP's traffic status. This is particularly useful in environments where power efficiency is critical, such as IoT (Internet of Things) devices or battery-powered wireless networks. The use of existing frame fields for signaling simplifies implementation and avoids the need for additional overhead.
4. The method as recited in claim 1 , wherein transmission of the trigger frame, reception of the respective uplink frames, and transmission of the M-BA frame are performed as part of an uplink multi-user (UL MU) frame exchange performed during the TWT service period.
This invention relates to wireless communication systems, specifically improving efficiency in uplink multi-user (UL MU) transmissions during Target Wake Time (TWT) service periods. The problem addressed is the need for synchronized and efficient data exchange in multi-user environments where devices wake up at scheduled times to transmit data, reducing power consumption and improving network performance. The method involves a wireless access point (AP) transmitting a trigger frame to multiple stations (STAs) during a TWT service period. The trigger frame prompts the STAs to transmit their respective uplink frames in a coordinated manner, allowing the AP to receive multiple transmissions simultaneously. After receiving the uplink frames, the AP transmits a multi-user block acknowledgment (M-BA) frame to acknowledge successful reception of the data from all participating STAs. This process ensures efficient use of the TWT service period by minimizing overhead and maximizing throughput while maintaining synchronization among the devices. The method optimizes UL MU transmissions by integrating the trigger frame, uplink frame reception, and M-BA transmission into a single coordinated exchange. This reduces latency and power consumption, as STAs only need to wake up briefly for the exchange, and the AP efficiently manages acknowledgments for multiple users. The approach is particularly useful in low-power and high-density wireless networks where energy efficiency and bandwidth utilization are critical.
5. The method as recited in claim 1 , wherein the configuration of the per AID TID field is effective to cause one or more of the stations to disregard a more data field of the M-BA frame when determining whether the low-power state is permitted.
This invention relates to wireless communication systems, specifically to methods for managing power states in stations (devices) within a network. The problem addressed is the inefficient handling of power-saving mechanisms in wireless networks, particularly when stations receive multi-station block acknowledgment (M-BA) frames. These frames indicate whether data transmission is complete, but stations may incorrectly interpret the "more data" field, leading to unnecessary wake-up cycles and increased power consumption. The invention provides a method where a per-AID (Association ID) TID (Traffic ID) field in the M-BA frame is configured to override the "more data" field. This configuration ensures that stations disregard the "more data" field when determining whether to enter a low-power state. By doing so, the method prevents stations from staying awake unnecessarily, reducing power consumption and improving energy efficiency. The solution is particularly useful in networks where stations frequently enter and exit low-power states, such as in IoT (Internet of Things) or sensor networks. The method enhances existing power-saving protocols by adding a configurable field that provides more precise control over station behavior, ensuring optimal power management without compromising data transmission reliability.
6. The method as recited in claim 1 , wherein the access point provides a wireless network in accordance with an Institute of Electrical and Electronics Engineers 802.11ax standard.
This invention relates to wireless network communication systems, specifically improving performance in networks operating under the IEEE 802.11ax standard. The 802.11ax standard, also known as Wi-Fi 6, introduces advanced features like orthogonal frequency-division multiple access (OFDMA) and multi-user multiple-input multiple-output (MU-MIMO) to enhance efficiency and capacity in dense wireless environments. However, challenges remain in optimizing network performance, particularly in handling multiple devices with varying data demands and interference conditions. The invention addresses these challenges by implementing a method where an access point (AP) manages wireless communication according to the 802.11ax standard. The AP dynamically allocates resources, such as frequency subchannels and spatial streams, to multiple client devices to maximize throughput and minimize latency. The method may involve scheduling techniques that prioritize high-demand applications or devices while mitigating interference. Additionally, the AP may adjust transmission parameters, such as modulation and coding schemes, based on real-time channel conditions to ensure reliable data delivery. By leveraging the capabilities of 802.11ax, the invention aims to improve network efficiency, reduce congestion, and enhance user experience in high-density wireless environments.
7. The method as recited in claim 1 , wherein the low-power state is a doze state or a sleep state of the one or more stations.
A method for managing power states in wireless communication systems addresses the challenge of optimizing energy efficiency in devices such as wireless stations. The method involves transitioning one or more stations to a low-power state, such as a doze state or a sleep state, to conserve energy while maintaining communication readiness. The doze state allows the station to periodically wake up to check for incoming data, while the sleep state involves a deeper power-saving mode with longer inactive periods. The method ensures that stations can efficiently balance power consumption and communication responsiveness, particularly in environments where devices operate on limited power sources. By dynamically adjusting power states, the method extends battery life without compromising network performance. The approach is applicable to various wireless technologies, including Wi-Fi and IoT devices, where energy efficiency is critical. The method may also include mechanisms to synchronize power state transitions across multiple stations to avoid communication disruptions. Overall, the solution provides a scalable and adaptable framework for power management in wireless networks.
8. A System-on-Chip (SoC) comprising: a wireless communication controller; a target wake time (TWT) controller implemented at least partially in hardware and configured to: transmit, via the wireless communication controller, a trigger frame to stations of a TWT session during a TWT service period of the TWT session; receive, via the wireless communication controller, respective uplink frames from the stations in response to transmission of the trigger frame; and transmit, via the wireless communication controller, a multi-block acknowledgment (M-BA) frame with a per association identifier traffic identifier (per AID TID) field configured to indicate whether one or more of the stations are permitted to enter a low-power state before an end of the TWT service period, the M-BA frame effective to cause at least one of the stations to enter the low-power state before the end of the TWT service period, the per AID TID field of the M-BA frame being configured to provide an indication as to whether the one or more stations are to use a more data field of the media access control (MAC) layer header of the M-BA frame to determine if the low-power state is permitted.
A System-on-Chip (SoC) is designed to optimize power efficiency in wireless communication networks, particularly in environments where devices operate in low-power states. The SoC includes a wireless communication controller and a Target Wake Time (TWT) controller implemented at least partially in hardware. The TWT controller manages communication sessions by transmitting a trigger frame to stations during a TWT service period, prompting them to send uplink frames. After receiving these frames, the TWT controller transmits a multi-block acknowledgment (M-BA) frame containing a per association identifier traffic identifier (per AID TID) field. This field indicates whether specific stations are permitted to enter a low-power state before the end of the TWT service period. The M-BA frame triggers at least one station to transition to a low-power state, conserving energy. The per AID TID field also directs stations to use the more data field in the MAC layer header of the M-BA frame to determine if entering the low-power state is allowed. This system enhances power efficiency by dynamically managing station wake times and reducing unnecessary active periods.
9. The SoC as recited in claim 8 , wherein the TWT controller is further configured to perform, after causing transmission of the M-BA frame, a frame exchange during the service period with at least another of the stations that was not permitted to enter the low-power state before the end of the service period.
A system-on-chip (SoC) for wireless communication networks, particularly in environments where power efficiency is critical, such as IoT or sensor networks. The SoC includes a target wake time (TWT) controller that manages power states of multiple stations (devices) in the network. The TWT controller schedules service periods during which stations can transmit data, allowing other stations to enter a low-power state to conserve energy. After transmitting a multi-station beacon (M-BA) frame to initiate the service period, the TWT controller ensures that at least one station not previously permitted to enter a low-power state remains active until the end of the service period. This prevents premature power-down, ensuring all scheduled transmissions complete successfully. The system optimizes energy efficiency by dynamically adjusting station power states while maintaining reliable communication. The TWT controller coordinates frame exchanges during the service period, ensuring that all participating stations have an opportunity to transmit data before entering a low-power state. This approach reduces overall power consumption in the network while maintaining communication reliability.
10. The SoC as recited in claim 8 , wherein a reserved bit in the per AID TID field of the M-BA frame provides the indication that the one or more stations are to use the more data field of the MAC layer header of the M-BA frame to determine if the low-power state is permitted.
A system-on-chip (SoC) for wireless communication networks, particularly in environments where power efficiency is critical, such as IoT or sensor networks. The invention addresses the challenge of managing power states in wireless devices by providing a mechanism to indicate whether a low-power state is permitted for one or more stations. The SoC includes a multi-station block acknowledgment (M-BA) frame generator that constructs frames with a per-association identifier (AID) traffic identifier (TID) field. A reserved bit within this field signals whether stations should check the "more data" field in the MAC layer header of the M-BA frame to determine if entering a low-power state is allowed. This approach ensures efficient power management by dynamically controlling when devices can transition to low-power modes, reducing unnecessary wake-up cycles and conserving energy. The system avoids ambiguity by explicitly using the reserved bit to direct stations to the "more data" field, which contains the final decision on power state permissions. This method enhances coordination between the access point and stations, optimizing network performance while minimizing power consumption.
11. The SoC as recited in claim 8 , wherein the transmission of the trigger frame, reception of the respective uplink frames, and transmission of the M-BA frame are performed as part of an uplink multi-user (UL MU) frame exchange performed during the TWT service period.
This invention relates to wireless communication systems, specifically to a system-on-chip (SoC) for managing uplink multi-user (UL MU) frame exchanges within a target wake time (TWT) service period. The problem addressed is the need for efficient and synchronized communication in wireless networks, particularly in scenarios where multiple devices transmit data to an access point during a scheduled TWT service period. The SoC includes a transceiver configured to transmit a trigger frame to multiple stations (STAs) within a wireless network. The trigger frame prompts the STAs to transmit their respective uplink frames to the SoC. The SoC then receives these uplink frames from the STAs and processes them. After processing, the SoC transmits a multi-station block acknowledgment (M-BA) frame to the STAs, acknowledging the successful reception of their uplink frames. The transmission of the trigger frame, reception of the uplink frames, and transmission of the M-BA frame are all performed as part of an UL MU frame exchange during the TWT service period. This ensures efficient use of the allocated time slot, reducing latency and improving overall network performance. The system optimizes communication by coordinating multiple STAs to transmit data in a synchronized manner, leveraging the TWT service period to minimize power consumption and enhance spectral efficiency.
12. The SoC as recited in claim 8 , wherein the configuration of the per AID TID field is effective to cause one or more of the stations to disregard a more data field of the M-BA frame when determining whether the low-power state is permitted.
A system-on-chip (SoC) for wireless communication networks, particularly in environments where power efficiency is critical, such as IoT or sensor networks. The invention addresses the challenge of reducing power consumption in wireless devices by enabling stations to enter a low-power state while ensuring reliable data transmission. The SoC includes a transceiver configured to generate and process multi-station block acknowledgment (M-BA) frames, which are used to acknowledge multiple data transmissions in a single frame. A key feature is the inclusion of a per-Association Identifier (AID) Traffic Identifier (TID) field within the M-BA frame, which allows the SoC to control whether individual stations can enter a low-power state. The configuration of this field can override the traditional "more data" field in the M-BA frame, preventing stations from exiting the low-power state unnecessarily. This ensures that stations remain in a power-saving mode unless explicitly required to stay active, thereby optimizing energy efficiency. The SoC may also include additional logic to manage frame transmission and reception, ensuring compatibility with existing wireless protocols while enhancing power management capabilities. The invention is particularly useful in scenarios where multiple devices must balance power consumption with data throughput, such as in smart home or industrial IoT applications.
13. The SoC as recited in claim 8 , wherein the wireless communication controller is configured to provide a wireless network in accordance with an Institute of Electrical and Electronics Engineers 802.11ax standard.
A system-on-chip (SoC) integrates a wireless communication controller designed to establish and manage a wireless network compliant with the IEEE 802.11ax standard, also known as Wi-Fi 6. This standard enhances wireless communication by improving efficiency, capacity, and performance in dense network environments. The SoC includes a processing unit, memory, and peripheral interfaces, with the wireless communication controller handling data transmission and reception. The 802.11ax standard introduces features such as orthogonal frequency-division multiple access (OFDMA), multi-user multiple-input multiple-output (MU-MIMO), and target wake time (TWT) to optimize bandwidth utilization and reduce power consumption. The controller supports these features to enable high-speed, low-latency communication in environments with multiple connected devices. The SoC may also include additional components like a power management unit, security modules, and input/output interfaces to support various applications. The wireless network established by the controller ensures reliable connectivity for devices operating under the 802.11ax standard, addressing challenges related to network congestion and energy efficiency in modern wireless systems.
14. The SoC as recited in claim 8 , wherein the SoC is embodied in whole or as part of an access point, a station device, a smart-phone, a broadband router, a wireless base station, a set-top box, a vehicle-based computing system, a smart appliance, or an Internet-of-Things device.
This invention relates to a system-on-chip (SoC) designed for wireless communication devices, addressing the need for efficient, scalable, and versatile integration of wireless connectivity in various electronic systems. The SoC includes a processing unit, memory, and wireless communication circuitry capable of supporting multiple wireless standards, such as Wi-Fi, Bluetooth, or cellular protocols. The wireless communication circuitry is configured to handle both transmission and reception of data, ensuring low-latency and high-throughput performance. The SoC may also incorporate security features, such as encryption and authentication modules, to protect data integrity and privacy. Additionally, the SoC is designed to be power-efficient, making it suitable for battery-operated devices. The invention further specifies that the SoC can be integrated into a wide range of devices, including access points, smartphones, broadband routers, wireless base stations, set-top boxes, vehicle-based computing systems, smart appliances, and Internet-of-Things (IoT) devices. This broad applicability ensures that the SoC can be deployed in diverse environments, from consumer electronics to industrial applications, while maintaining compatibility with existing wireless infrastructure. The design emphasizes modularity, allowing manufacturers to customize the SoC for specific use cases without compromising performance or security.
15. A computer-readable storage media comprising instructions that, responsive to execution by a hardware-based processor, implement a target wake time controller (TWT) controller to: transmit, via a wireless interface associated with the hardware-based processor, a trigger frame to stations of a TWT session during a TWT service period of the TWT session; receive, via the wireless interface associated with the hardware-based processor, respective uplink frames from the stations in response to transmission of the trigger frame; and transmit, via the wireless interface associated with the hardware-based processor, a multi-block acknowledgment (M-BA) frame with a per association identifier traffic identifier (per AID TID) field configured to indicate whether one or more of the stations are permitted to enter a low-power state before an end of the TWT service period, the M-BA frame effective to cause at least one of the stations to enter the low-power state before the end of the TWT service period, the per AID TID field of the M-BA frame being configured to provide an indication as to whether the one or more stations are to use a more data field of the media access control (MAC) layer header of the M-BA frame to determine if the low-power state is permitted.
This invention relates to wireless communication systems, specifically targeting energy efficiency in target wake time (TWT) sessions. The problem addressed is the unnecessary power consumption of wireless stations during TWT service periods, where stations remain active even when they have no further data to transmit or receive. The system includes a target wake time controller (TWT controller) implemented via executable instructions on a hardware-based processor. The controller transmits a trigger frame to stations participating in a TWT session during a TWT service period, prompting the stations to send uplink frames. After receiving these uplink frames, the controller transmits a multi-block acknowledgment (M-BA) frame. This frame includes a per association identifier traffic identifier (per AID TID) field, which indicates whether specific stations are allowed to enter a low-power state before the service period ends. The M-BA frame also uses a more data field in the MAC layer header to further signal whether the low-power state is permitted. Stations receiving this frame can then determine if they can enter a low-power state early, reducing energy consumption. The system ensures efficient power management by dynamically controlling station wake times based on traffic conditions.
16. The computer-readable storage media as recited in claim 15 , wherein the TWT controller is further implemented to perform, after transmission of the M-BA frame, a frame exchange during the service period with at least another of the stations that was not permitted to enter the low-power state before the end of the service period.
This invention relates to wireless communication systems, specifically to power management in wireless networks using Target Wake Time (TWT) scheduling. The problem addressed is inefficient power consumption in wireless stations during service periods, where stations may unnecessarily remain in an active state even when not transmitting or receiving data. The invention involves a system where a TWT controller manages power states of multiple stations in a wireless network. The controller transmits a multi-station beacon frame (M-BA frame) to schedule service periods for multiple stations, allowing some stations to enter a low-power state while others remain active. After transmitting the M-BA frame, the controller conducts a frame exchange with at least one station that was not permitted to enter the low-power state before the service period ends. This ensures that active stations can communicate without unnecessary delays while inactive stations conserve power. The system optimizes power usage by dynamically adjusting station states based on scheduled service periods, reducing energy consumption without disrupting communication. The frame exchange mechanism ensures that active stations can transmit or receive data efficiently, while inactive stations remain in a low-power state until their scheduled wake time. This approach improves overall network efficiency and battery life for wireless devices.
17. The computer-readable storage media as recited in claim 15 , wherein a reserved bit in the per AID TID field of the M-BA frame provides the indication that the one or more stations are to use the more data field of the MAC layer header of the M-BA frame to determine if the low-power state is permitted.
This invention relates to wireless communication systems, specifically to methods for managing power states in stations (devices) within a network. The problem addressed is the need for efficient power management in wireless networks, particularly in scenarios where stations may enter a low-power state to conserve energy. The invention provides a mechanism for indicating whether a station is permitted to enter a low-power state after receiving a multi-station block acknowledgment (M-BA) frame. The solution involves using a reserved bit in the per Association Identifier (AID) Traffic Identifier (TID) field of the M-BA frame to signal whether stations should check the "more data" field in the Media Access Control (MAC) layer header of the M-BA frame. If the reserved bit is set, the stations must evaluate the "more data" field to determine if they are allowed to enter a low-power state. This ensures that stations only transition to low-power mode when it is safe to do so, preventing data loss or communication disruptions. The invention enhances power efficiency in wireless networks by providing a clear and standardized method for stations to decide when entering a low-power state, reducing unnecessary energy consumption while maintaining reliable communication. The use of existing fields in the M-BA frame ensures backward compatibility with current wireless standards.
18. The computer-readable storage media as recited in claim 15 , wherein the configuration of the per AID TID field is effective to cause one or more of the stations to disregard a more data field of the M-BA frame when determining whether the low-power state is permitted.
This invention relates to wireless communication systems, specifically to power-saving mechanisms in wireless networks. The problem addressed is improving energy efficiency in wireless devices by optimizing how they interpret control frames that indicate whether additional data is pending. In wireless networks, stations (devices) enter low-power states to conserve energy, but they must remain awake to receive data. A More Data field in control frames signals whether more data is coming, but current methods may cause unnecessary wake-ups if the field is misinterpreted. The invention modifies the configuration of a Traffic Identifier (TID) field within an Association Identifier (AID) subfield in a Multi-Station Block Acknowledgement (M-BA) frame. This configuration allows stations to ignore the More Data field when deciding whether to enter a low-power state. By doing so, the system reduces unnecessary wake-ups, improving energy efficiency. The TID field is structured to include information that overrides the More Data field, ensuring stations only stay awake when truly needed. This approach is particularly useful in dense networks where frequent transmissions occur, as it minimizes power consumption without compromising data delivery reliability. The invention enhances existing power-saving protocols by providing a more intelligent way to handle control frame interpretations.
19. The computer-readable storage media as recited in claim 15 , wherein the transmission of the trigger frame, reception of the respective uplink frames, and transmission of the M-BA frame are performed as part of an uplink multi-user (UL MU) frame exchange performed during the TWT service period.
This invention relates to wireless communication systems, specifically improving efficiency in uplink multi-user (UL MU) transmissions during Target Wake Time (TWT) service periods. The problem addressed is the need for synchronized and efficient data exchange in wireless networks where multiple devices transmit data to an access point during scheduled TWT periods, reducing power consumption and improving network performance. The invention involves a method for managing UL MU transmissions within a TWT service period. A trigger frame is transmitted to multiple wireless devices, instructing them to send uplink frames in a coordinated manner. The access point then receives these uplink frames from the devices. After processing the received data, the access point transmits a multi-user block acknowledgment (M-BA) frame to acknowledge successful reception of the uplink frames. This sequence—trigger frame transmission, uplink frame reception, and M-BA frame transmission—is performed as part of an UL MU frame exchange specifically during the TWT service period. The TWT service period is a scheduled time slot where devices wake up to transmit data, conserving power by minimizing active transmission times. The UL MU exchange ensures efficient use of the TWT period by allowing multiple devices to transmit and receive acknowledgments in a synchronized manner, reducing overhead and improving throughput. This approach is particularly useful in wireless networks like Wi-Fi, where power efficiency and bandwidth utilization are critical.
20. The computer-readable storage media as recited in claim 15 , wherein the low-power state is a doze state or a sleep state of the one or more stations of the TWT session.
This invention relates to wireless communication systems, specifically managing power states in Time-Wavelength and Time-Division Multiplexing (TWT) sessions to improve energy efficiency. The problem addressed is the excessive power consumption of wireless stations during idle periods, which reduces battery life and operational efficiency. The invention involves a method for transitioning one or more stations in a TWT session to a low-power state, such as a doze or sleep state, during inactive periods. The system monitors the TWT session to detect when no data transmission is occurring, then signals the stations to enter the low-power state to conserve energy. When data transmission resumes, the stations are awakened to resume normal operation. The invention also includes mechanisms to ensure synchronization between the stations and the access point, preventing missed transmissions during the low-power state. The low-power state can be either a doze state, where the station remains partially active to quickly resume operation, or a sleep state, where the station powers down further for deeper energy savings. The transition between these states is managed dynamically based on traffic patterns and session requirements. This approach reduces unnecessary power consumption while maintaining reliable communication in TWT sessions.
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September 29, 2020
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